<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./jq-3.6.0.js"></script>
    <style>
        input[type=text] {
            width: 100px;
        }
        
        input[type=text]::placeholder {
            background-color: red;
        }
    </style>
</head>

<body>
    <input type="text" placeholder="2222">
    <input type="text" placeholder="1111">
    <input type="number">
    <input type="checkbox" checked="true">
</body>
<script>
    console.log($('input'));
</script>

</html>